Problem with Contains - missing records

Question

Hi, 
I have created a full-text catalog for my table tDoc, but when I search records with contains, 
I dont get all records. I search for 16949, and with LIKE, I get all 5, but with CONTAINS I only 
get three. Se image below.
What I am doing wrong?
It does not make any difference if I use wildcards (*) with contains.
/Daniel.

Answer 1

Hi Samus
I hope you are still here, If so, then please close the thread by marking the answer that fit your needs or please inform us if the issue is still open. In the mean time I will try to give some
points that you need to consider
>> Full-text queries perform linguistic searches against text on
words and
phrases based on rules of a particular language.
* It is look like you use FTS as a "like" filter, and this is not the same! It's like using subtraction in math, in order to obtain the + behavior. It can be done [10-(-10)], but should it done? are you using the right operator if you want
to get "like" filter? In contrast to full-text search, the LIKE Transact-SQL predicate works on character patterns only.
* Jayakumaur gave you the great basic explanationIn the forum we can not always to write the exact full tutorial. It is more of a short solutions place, where we can point you to external links if needed.
* It is not that "/" is a noise exactly (actually this statement was wrong). It is more of "Separator" between words. SQL Server FTS engine recognize that this is not part of the word. Same with "," or spaces for example, but
not "_" which in most languages used as part of the word. The engine work on linguistic searches, like it "understand" the language (using the dictionary it has), and therefore it recognize starting/ending of "words". It is working
on word but phrases as well.
FTS separates the string into individual words based on word boundaries (Separators).
You can see the words split result using this statement:
SELECT * FROM sys.dm_fts_parser (' "Standard ISO_TS_16949_2009" ', 1033, 0, 0)
GO
Now you can see that those words do not fit your search :-)
* Moreover you can chake this "Standard ISO_TS_16949_2009 is", and see what a noise word mean (the "is" is a Noise word and not the "/")
* Now you can try "Certifikat ISO TS/16949" and you will see that "/" is not a word at all but only a "Separator".
>> FTS will not match the exact word, but the
meaning of the words in the search condition.
>>See more:
http://msdn.microsoft.com/en-us/library/ms142571.aspx#like
* Configure and Manage Word Breakers and Stemmers for FTS (by default "_" is not a Breakers but you can add it if you want!)
http://technet.microsoft.com/en-us/library/ms142509%28v=sql.110%29.aspx
* sys.dm_fts_parser (Transact-SQL)
http://technet.microsoft.com/en-us/library/cc280463%28v=sql.110%29.aspx
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